1 /*
   2  * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.gc.shared;
  26 
  27 import java.util.*;
  28 
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.gc.cms.*;
  31 import sun.jvm.hotspot.gc.serial.*;
  32 import sun.jvm.hotspot.runtime.*;
  33 import sun.jvm.hotspot.types.*;
  34 
  35 /** Factory containing a VirtualConstructor suitable for instantiating
  36     wrapper objects for all types of generations */
  37 
  38 public class GenerationFactory {
  39   private static VirtualConstructor ctor;
  40 
  41   static {
  42     VM.registerVMInitializedObserver(new Observer() {
  43         public void update(Observable o, Object data) {
  44           initialize(VM.getVM().getTypeDataBase());
  45         }
  46       });
  47   }
  48 
  49   private static synchronized void initialize(TypeDataBase db) {
  50     ctor = new VirtualConstructor(db);
  51 
  52     ctor.addMapping("DefNewGeneration", DefNewGeneration.class);
  53     ctor.addMapping("ParNewGeneration", ParNewGeneration.class);
  54     ctor.addMapping("TenuredGeneration", TenuredGeneration.class);
  55     ctor.addMapping("ConcurrentMarkSweepGeneration", ConcurrentMarkSweepGeneration.class);
  56   }
  57 
  58   public static Generation newObject(Address addr) {
  59       try {
  60           return (Generation) ctor.instantiateWrapperFor(addr);
  61       } catch (WrongTypeException e) {
  62           return new Generation(addr) {
  63                   public String name() {
  64                       return "unknown generation type";
  65                   }
  66                   public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
  67                   }
  68                   public void printOn(java.io.PrintStream tty) {
  69                       tty.println("unknown subtype of Generation @ " + getAddress() + " (" +
  70                                   virtualSpace().low() + "," + virtualSpace().high() + ")");
  71                   }
  72                   public long used() {
  73                       return 0;
  74                   }
  75                   public long free() {
  76                       return 0;
  77                   }
  78                   public long capacity() {
  79                       return 0;
  80                   }
  81                   public long contiguousAvailable() {
  82                       return 0;
  83                   }
  84 
  85               };
  86       }
  87   }
  88 }